Shunt Active Filter
◆ Three-level technology, high power density
◆ Supports three compensation modes: harmonics, reactive power, and imbalance
◆ FPGA + ARM architecture, fast computing speed, and smarter interfaces
◆ Standard rack size, easy to install in various industry-standard cabinets
◆ Unique patented technology, completely independent air ducting, eliminating any PCBAs or electronic components
Products Description
Shunt active filter, a new generation of fully digital harmonic elimination devices independently developed and launched by our company, offer distinct advantages over traditional technologies: faster, smaller, more powerful, and easy to install, maintain, and debug, they can easily resolve power quality issues.
Shunt active filters utilize power electronics technology. The main circuit includes: circuit breakers, fast-acting fuses, surge protectors, main contactors, snubber contactors, grid-connected inductors, LC filters, converters, and DC energy storage capacitors.
The control system of the active haromonic filter incorporates a DSP+FPGA, command current calculation circuits, and current tracking control circuits to enable parameter setting and control command acquisition. The power harmonic filer uses a current transformer to detect the load current. A data processing chip converts the analog signal into a digital signal, which is then sent to the internal DSP. Through algorithmic processing, the signal is extracted from the harmonic components of the load current. The control system then issues a command signal, which uses SVPWM control as a drive signal to control the internal IGBTs. This instructs the inverter to generate a harmonic current equal in magnitude and opposite in direction to the load harmonic current, which is then injected into the grid to filter out the harmonics.
Data Sheet
| Electrical parameters | |
| Wiring method | Three-phase three-wire, three-phase four-wire |
| Operating voltage | 380V(±20%) |
| Operating frequency | 50/60Hz, ±10% |
| Product specifications | 50,75,100A,150A,200A |
| Current transformer specifications | 50:5 ~ 30000:5 |
| Noise | ＜65dB |
| Features | |
| Switching devices | IGBT |
| Switching frequency | >20kHz |
| Heat dissipation methods | Intelligent air cooling |
| Heat dissipation control | Adaptive fan speed adjustment |
| Protection functions | Overvoltage, undervoltage, overheating, overcurrent, short circuit protection |
| Compensation performance | |
| Harmonic filtering rate | ＞95% |
| Active power loss | ＜3% |
| Harmonic filtering range | Harmonics from 2nd to 50th can be individually controlled and configured. |
| Total response time | ＜10ms |
| Resonance suppression | Active inhibition |
| Display Interface | |
| Display screen | 7-foot full-color touchscreen (cabinet type) |
| Language | Chinese, English, and customizable languages |
| Battery display | Distortion rate, power factor, power, voltage, current, and other data display |
| Communication interface and protocol type | RS485, Modbus protocol |
| Environmental conditions | |
| Operating temperature | -10℃~+40℃ |
| Relative humidity | <95%, no condensation |
| Altitude | <5000 meters (above 1000 meters, capacity decreases by 1% for every additional 100 meters) |
| Others | |
| Protection level | IP20 rating, other ratings available upon request. |
| Installation method | Rack-mount, wall-mount, integrated cabinet configurations. |
Q&A
1. What are the operating modes of an active harmonic filter?
An active harmonic filter can operate in three modes:
- Selectable mode: Allows you to select the harmonics to be eliminated and includes load balancing functionality.
- Full harmonic mode: Eliminates all harmonics and compensates for reactive power in real time.
- Harmonic-only mode: Eliminates harmonics but does not affect reactive power.
2. What does "topology" mean in an active harmonic filter?
Simply put, topology refers to the arrangement of the semiconductor devices inside the active harmonic filter, used to generate compensation current. There are two main topologies on the market: two-level and three-level NPC (neutral point clamp) topologies. The number of voltage levels determines the accuracy of the filter output and the stress on the semiconductor devices. The more levels, the lower the voltage stress, the less heat generated, and the better the performance.
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